Multiphase arc-lamp.



No. 730,399. PATENTED JUNE 16, 1903. R. FLEMING.

MULTIPHASE ARC LAMP.

APPLICATION FILED DBO. 221 1902.

N0 MODEL. 4 SHEETS-SHEET 1.

(.Dibhesses: p Indenbol J/ZL M 7 Richard FIerning- My? YM M W aqbu m: r-oRms Pz'rzns cu. PNOTD-LITHO. WASHINGTON. u c

No. 730,899. PATENTED JUNE 16, 1903. R. FLEMING.

MULTIPH'ASE ARC LAMP.

APPLICATION FILED DEC. 22. 1902.

N0 MODEL. 4 SHEETS-SHEET 2.

witnesses: Inerwbor Richard Flemir g PATENTED JUNE 16, 1903.

R. FLEMING.

MULTIPHASE ARC LAMP.

APPLICATION FILED DEC. 22. 1902.

4 SHEETS-$HEET 3.

"J. IE

HO MODEL.

Inoenboh Richard Fleming witnesses. I

PATENTED JUNE 16, 1903.,

R. FLEMING. MULTIPHASE ARC LAMP.

APPLICATION FILED DEC. 22, 1902.

4 SHEETS-SHEET 4.

H0 MODEL.

Y Wm; mm a el. p hd (Dibnesses UNITED STATES Fatented June 16, 1903.

PATENT OFFICE.

RICHARD FLEMING, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

M ULTIPHA SE ARC-LAM P.

SPECIFICATION forming part of Letters Patent No. 730,899, dated June 16, 1903. 7

Application filed December 22, 1902. Serial No. 136,096. (No model.)

To all whom it may concern;

Be it known that I, RICHARD FLEMING, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvem ents in Multiphase Arc-Lamps, of which the following is a specification.

The object of my invention is the production of a simple and compact arc-lamp which will operate on a multiphase circuit, and particularly one in which the electrodes of the lamp are fed by an induction-motor.

My invention consists in certain features of construction and arrangement more particularly hereinafter pointed out in the claims.

' I have illustrated anembodiment of my invention in the accompanying drawings, in which Figure 1 is an elevation partly in section. Fig. 2 is a section taken 011 the line of 2 3 of Fig. 1 looking toward the top of the lamp. Fig. is a section taken on the line 2 3 of Fig. 1 looking toward the bottom of the lamp. Fig. 4 is a section taken on the line 4 a of Fig. 1. the line 5 5 of Fig. 4., and Fig. (5 is a diagram showing the arrangements of the circuits supplying current to and regulating the lamp.

The lamp which I have shown and described 011 the upper side" is provided with a cap 1. of the cap-piece 1 suitable means are provided by which the lamp may be suspended. Situated just below'the cap-piece l is a fieldmagnet 2, the purpose of which will be hereinafter explained. In the construction which I have illustrated in the drawings the fieldmagnet consists of an annular mass of laminated iron provided with internal polar projections 2. pair of end plates 4 and 5. The end plate 4: carries a bracket or frame 6, and this is secured to the under side of the cap 1 by means of posts 7. The lower end plate 5 carries a frame or bracket 8.

Situated below the frame 8 and connected thereto by posts 9 is a cup-shaped support 10, Fig. 5. In this cup is secured by means of screws 11 a block 12, of a suitable refractory non-conducting material, such as porcelain. I The outer side of the supportlO is substantiallyconical except for three lugs or enlarge- "the extensions 13.

V jecting arms or extensions 20.

Fig. 5 is a partial section taken on The laminae are held between av ments 10, separated from each other by one hundred and twenty degrees. Blocks or posts 13 are secured to the lugs13 in any suitable manner, as by means of screws 14:, threaded into sockets 15. Bars 16 extend perpendicularly from near the upper end of Carriages 17 slide along the bars 16. In the drawings I have illustrated these carriages 17 as made each of a U shaped piece of sheet metal, thelegs of the U shaped piece being perforated to receive the bar 16. A rack-bar 18 is connected with the top of each carriage 17 in any suitable manner, as by a screw 19, and extends parallel to the bar 16. The carriages 17 carry downwardly-pro- In the drawings I have illustrated the extensions 20 as being formed of strip metal. The extensions 20, which pass around the member 16 be tween the legs of the clip or carriage 17, are insulated both from the carriage 17 and the member 16. The lower 'ends of these extensions form clamping-jaws to engage and hold the arc-lamp electrodes 21 in a position parallel to the bars 16. A thumb-screw 22 is provided for forcing the jaws of the clamp together upon the electrode. The upper ends of the posts 13 may be provided with guidingslots for the bars 18, as shown in the drawings.

The electrodes pass inwardly through insulating bushings 21 in the wall of the support 10 substantially perpendicular to the outer conical wall of this bushing. Channels 23 are formed in the block of refractory material 12, in which the electrodes are placed. A central cup-shaped depression 23 is also formed in the block 12, which being located above the meeting-points of the electrodes, forms a reflector to throw the light downward.

The brackets 6 and 8 are provided with bearings in which the shaft of the rotary member 24 of an induction-motor is journaled. This rotary member may be a squirrelcage armature of the ordinary type and is placed to revolve within the space between the polar projections 2 ofthe field-magnet before mentioned. The shaft of the induction-motor carries at its lower end, below the bracket 8, a spur-gear 25, which meshes with a large idler 26, which turns a small spurgear 27, which in turn drives a large gear 28,

carried on a shaft 2.), located below the spurgear 25, and which may form an extension of the armature-shaft or be sleeved thereon. The shaft 29 carries a spiral gear 30, which engages with the teeth 31 on the rack-bars 18. The teeth of the gear 30 are inclined sufficiently to engage squarely with the rack-teeth of the bars 18, which do not extend perpendicularly to the shaft 2.), but perpendicularly to the cone-shaped support 10.

It will readily be seen that a rotation of the shaft 29 in one direction will feed the electrodes toward their converging point, while a rotation in the opposite direction will tend to separate the electrodes. The various spurgears form a speed-reducing connection between the shaft of the armature and the shaft 29.

A transparent or translucent casing 32 is held against the bottom of the support 10 by means of springs and a stirrup 34. This casing 32 forms the inclosing globe of the lamp. A casing 35, formed of sheet metal and held in position in the usual manner surrounds the main portion of the lamp mechanism between the cap 1 and the bottom of the support 10. This casing is apertured to receive the members 18 16 and the electrodes 21.

In the diagram shown in Fig. 6, T represents a three-phase transformer connected in delta or other source of energy from which extend supply-lines 36, 37, and 38. Lines 30, 40, and 41 extend from the lines 36, 337, and 38, respectively, each to one of the electrodes 21. Steadying-inductances i2 are placed in each of these lines. The lines also include in series windings 39, a0, and 4:1, which form the windings for three of the polar extensions 2 of the field magnet, separated from one another by one hundred and twenty degrees, as shown. The windings for the other polar extensions 30, 40, and 4:1 are formed in shunt across the lines 40 3111(141, 41 and 39, and 3t) and 40, respectively. Suitable switches (not shown) may be provided between thell steadying-inductances 12 on the lines 36, 3'7, and 38, respectively.

The operation of my lamp is as follows: Assuming the electrodes to be separated, on closing the switches in the lines 39, 40, and 4:1, respectively, current will begin to flow through the windings 39, 4:0", and 411". Thissets up a rotary magnetic field, which turns the armature 24 in the direction suitable to feed the electrodes toward their point of convergence. When the electrodes contact with one another, current begins to flow througlr the electrodes. This energizes the polar eX- tensions surrounded by the windings 39, 4:0," and 41. These are connected, as shown, so as to produce a magnetic field rotating in opposite direction from that produced by the windings 3E), 5L0, and 41, and these fields are proportion-ed so that on the passage of an excess of current through the electrodes, as

at starting, the field produced by the windings 3f), 10, and -11 overcomes that produced by the other windings and rotates the armature in such a direction as to separate the electrodes. \Vhen the electrodes have been separated the desired amount, the increased resistance of the are due to such separation diminishes the current flowing through the windings 39, 40, and i1, so that the fields produced by the two sets of windings balance one another and the armature remains at rest. An increase of resistance in the are, causing a further diminishing of the current in the series windings, will have the effect of causing the armature to turn in the feeding direction under the influence of the shuntwindings, while an increase of current passin g through the series windings will cause the electrodes to be separated. By this arrangement a very sensitive and efficient feeding mechanism is obtained.

What I claim as new, and desire to secure by Letters Patent of the United States, is-- 1. In an arc-lamp embodying multiphase circuits, an electrode placed in each branch of the multiphase circuit and an electromagnet having a plurality of windings, some of the windings being included in the aforesaid branches of the multiphase circuit and other of the windings being included in branches derived therefrom, and a member actuated by said electromagnet to feed the electrodes toward or away from one another, according to the condition of the lamp.

2. In a multiphase arc-lamp, an electrode in each branch of a multiphase system, a winding also placed in each branch of said multiphase system, other windings in circuits derived from said first-mentioned circuits, and a memberfor feeding said electrodes actuated by the joint action of all of said windings.

3. In an arc-lamp, a plurality of electrodes, said electrodes being so placed as to form elements of a cone, rack-bars connected to said electrodes and substantially parallel therewith, and a spiral gear for engaging said rack-bars to feed said electrodes.

4. In a multiphase arc-lamp, a movable electrode in each branch of a multiphase circuit and an induction-motor for feeding said electrodes, windings for producing a magnetic field for said motor rotating in one direction located in each branch of the multiphase system, and windings for producing a magnetic field for said motor rotating in the opposite direction placed in circuits derived from said branch circuits.

5. In an arc-lamp embodying multiphase circuits, a movable electrode placed in each branch of said circuit, circuits in shunt to said branches of the multiphase circuit, and a member for moving said electrodes influenced by the current passing in all of said circuits.

6. In a multiphase arc-lamp having an electrode in each branch of the multiphase system, an induction-motor for feeding said electrodes comprising a rotary member and a stationary member, means for producing a magnetic flux in said stationary member rotating in one direction upon an increase of resistance in the arc, and means for producing a flux in said stationary member rotating in the opposite direction upon a decrease in resistance of the are.

7. In a multiphase arc-lamp having an electrode in each branch of the multiphase sys tem, an induction -motor for feeding said electrodes comprising a rotary member and a stationary member, and means for producing a magnetic flux in said stationary member rotating in one direction upon an increase in current flowing through the electrodes and rotating in the opposite direction upon a decrease in the current flowing through the electrodes.

8. In an arc-lamp, a plurality of circuits, movable electrodes placed in each of said circuits, means for supplying phase-displaced currents to said circuits, other circuits in shunt to said first-mentioned circuits, and a member for feeding said electrodes moved in one direction by current passing in the firstmentioned circuits and moved in the opposite direction by current passing in the other circuits.

9. 111 an arc-lamp, a plurality of movable electrodes, means for supplying phase-displaced current to said electrodes, and means for moving said electrodes toward a common point.

10. In an arc-lamp, a plurality of movable electrodes, means for supplying phase-displaced current to said electrodes, and means for moving said electrodes toward a common point influenced by the current passing through the electrodes.

In witness whereof I have hereunto set my hand this 19th day of December, 1902.

RICHARD FLEMING.

lVitnesses:

JOHN A. MoMANUs, DUGALD MoK. MoKILLoP. 

